Biodiversity Heritage Library mailto:biodiversitylibrary@gmail.com Illinois. Dept. of Natural Resources. Office of Scientific Research and Analysis. creator Critical Trends Assessment Project. contributor Illinois State Geological Survey. contributor Illinois. Dept. of Natural Resources. contributor text book University Library, University of Illinois Urbana Champaign 4 Springfield, Ill Illinois Dept. of Natural Resources 1998- 1998 4

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English Illinois Illinois River Watershed Illinois River Watershed (Ill.) Natural resources conservation areas Natural resources surveys https://www.biodiversitylibrary.org/item/100540 39165585 10.5962/bhl.title.46519 University Library, University of Illinois Urbana Champaign https://www.biodiversitylibrary.org/item/100540 https://www.biodiversitylibrary.org/pagethumb/32253163 4 Not provided. Contact Holding Institution to verify copyright status. SPI